Tumbles in a variety of stones. Luminous cubes are man-made and glow under black light, and can be used as icecubes in drinks! It is not advised to use natural stones as icecubes. Red Tigereye is man-manipulated with heat to get the red color from yellow tigereye. Size will vary. The tumbles are randomly selected. The assorted stones may include unlisted varieties and can not be requested. Due to the nature of rocks, all pieces vary.